Collapsible core.



W. Y. DUNCAN, JR."

COLLAPSIBLE CORE. APPLICATION FILED 'JULY 3, I916.

Patented Oct. 2, 1917.

v 2 $HEET$-SHEET 'INVENTOR.

H ATTORNEYS.

W. Y. DUNCAN, JR.

Patented Oct. 2,1917.

2 SHEETS- [N V ENTOR A TTORNE YS.

WILLIAIVI'Y. uncan-an, or SPRINGFIELD, MASSACHUSETTS, AsSreivoR TOFISK 'RUBBER.GO1VIPANY, or cnrcornn FALLS, MASSAGEUSETTS,'A'COEPOBA'I'ION- or 1 .MASSACHUSETTS.

coLL rSIBLn corn].

1,24 ,942. i specification of Letters Pat int. :2, 1917. I

' Application filed m 3,1916. Serial Nd; 107,301.

To all whom it may camera g Be it known that I, 'lVILLIAM Y.D N

can, Jr;,a citizen of the United Sta'tesof America, residing at Springfield, in the 5 county of 'Hampden and Stateof Massachusetts, have invented'certain new and useful Improvements in Collapsible Cores, of

which the following is a specification."

' This invention relates to collapsible-cores and particularly to ilnproved'cores of this type which are adaptedfor use in'the manufacture of the outer casings or shoes of pneu-' matic tires.

An object of the invention is-to provide a 5 collapsible core, consisting of "an annular ring formed with a'plurality'of sections and slidable devices in certain of the sections adapted to'overlap the joints between sections to securely hold the latter; in ring.

forming position. v

Another object of the invention is'to provide in a collapsible core having .a plurality of sections adapted to abut with one another to form an annular ring, means cooperating.

with the abutting'end faces of the sections to prevent relative lateral displacement thereof and curved slidable keys movable in a circular slot formed in the core ring to overlap the joints between abutting sections to'prevent inward displacement thereof,said keys being movable to a position wherem the sectionsmay be withdrawn inwardly when desired. r 1

' Other objects and advantages will appear in the description to follow and in the an neXed claims. I

For the'purpose of illustrating one way in which the invention may be practised, a

preferred embodiment thereof is shown in 40 the accompanying drawings, iii-which Figure'l is a plan view,part ly in section,

of the assembled core;

Fig. 2 is a side elevational view thereof;

I Figs. 3 and i are fragmentary views showing modifications of the structure shown in Fig.2;

Fig. 5 is across sectional view taken on the line 5-5 of Fig. 1 and looking'in the direction of the arrows; and Figs. 6, '7, 8, and9 are diagrammatical views showing modifications in'the shape of the sliding key shown in Fig. 5.

Referring to these drawings in detail, the

assembled core is an annulus and is madeup 5 5 of a plurality of sections 1 in the customary way to permit removal of 'the core from the tlreshoe after the curing operation. The

number of sections into whichthecore is divided may be variedas desired'but,'}in practice, the division of the'core, as shown 0 in-Fig. 1', into four sections, two of which are relatively small, has been found satisfactory; In the drawing, the end faces of the smaller sections'l have been shown as diverging inwardly toward'the center of the 5 core ring to permit ready withdrawal,"but they may, if desired, be substantially p'aral lel'or may diver'ge atother angles than that shown'yas 'itis" onlyessential that the severalsections-*be'arranged for 'inward Withdrawalfrom the tires'hoe; e -The sections 1 have the cross sectional shape shown in Fig. 5, and thecontour of the outer-portions thereof may bevaried to suit" the desired conforinationof the inner surface of'the' tire' Shoe. The usual cored passages 2 are provided'in theouter por tions'of the sections, as-shown in Figs. 1 and .5 andextending inwardly :from the outer portions are centrally 'arranged'webs 3, at the basesof which and 'extending'on either side thereof, areflanged portions 4.. i-thin each inner flange 4 and in concentrical-relation therewith is formed an arcuate slots, which is 'inclose'd-on three sides and g5 partially inclos'ed 011 the fourth and inner side except for a narrow slot 6 leading from S1013 5 to the inner face of the flange. The ends ofthe several slots -5 'and' '6 coincide to form true circular slots, and curved keys o 7, of any suitable number depending onthe number'of core sections 1, are arranged toslide'in slots 5, the keys being provided with pins '8 whichride'inslots 5 and protrude be yond the inner faces of flanges 4 for conven i'entactuation of the keys. The latter may. be ofsquare cross sectionas' shown in Fig; 5, or of any other suitable or desirable shape, such, for example,- as the"'olovetail-- keys 9 and '10, shown'in Figs. (land 7,,respectively, or the round and half-round keys 11 and 12, shown in Figs. 8 and 9, respectively. Pref-. erably' the corners of keys 7 'arerounded, as shown in Fig. 5, and several holes 13 ar drilled'laterall'y in flanges 45 to" permit'ioi'l or'other lubricating materialft'obe introduced into slot 5 when defsi1'f'e'd.-"; The numher and length of keys 7 will depend upon T the particular subdivision of the core which is adopted, but, withthe ar'ra'ngement of 110 core sections shown in F lg, 1, it has been found that two 'keys,.eac'h of such a length astoicoverfsubstantially a ninety degree are of slot 5, is a satisfactory arrangement. The several sections 1 are adapted roam with one another on the lines 14: to formfa complete annu'lar core ring and 15 represents merely the usual liller plates which may be considered as fastened to and con S it ing part o e m ll r 0 c; 1. s- Ateach joint betweenthe sections, keys 16 a 1 Pr v d d h ay 1. b fixed i @116, of the abuttingsections Qpreferably the larger sections) by any suitablegneanfs, such as a driving fit, forexample. flhese keys 16 may be ,round, as shown in lfig. 2, square 1 or hal tround, in cross sectional. shape, as j show-n at 17 and 18 in Figs. 18 and &,,respectively-, or of any other suitable or desirable-shape. ,VVifth the partsfpositioned as' in -F-ig. 1', the corefmjay be takenjapartby fi'jrst .-movns;w he y fi, so t a e ch i e ir y within the slot 5 in ;one. of the larger core sections, and t then 'withd'rawing the smaller sections 1 inwardly from the tire sh;oe,;leaving keys 16 fixed the two larger sections. The two larger sections may then be -readily removed from the tireshoe In assembling the core, the sections :1 are fitted together in abutting relation, and the keys 16 serve ,to position the isectionsdaterally, as well as circumferentiallyso that the core inay be assembled to form a -tr ue annular rin-g. ;It is then necessary to hold theseveralsections togethen and this is accomplished sliding keys? from theslots in the larger core sections to the positions shown in Fig. 1 wh rei e h ,k y 7 P e mp ely through the smaller core sections, ,projects a;.substantial distance into each of the abutting sections and overlaps the jointsthereet V V i a Thus, the sections may be securely locked together quickly and conveniently by sim-ple means as distinguished from the bolt connections, loekin-g andbi-nding rings hereto.- fore used which not only require theuseof oo s (f qu i l of Spe h c e bu consume valuable time for their operation. he pre e t is qt r i h ac erize by e t r a s e bel s and th r spe ial vise c swm yu m qyedla the t is'arranged to be assembled and taken apart rapidly and conveniently without the aid of o -.11..

Jh nv o rl sbeen d fi e in a pr ferred n form with detailed variations for illustrative purposes, but the scope o'f the invention is defined by the a-p pended claiins rather than by the foregoing description.

1. A collapsible core, comprising, an anmenses nu'lar ri g made up of a plurality of sections and :sl'idab'le devices adapted to 'lie wholly whereby the sections are held in cooperative relation-tonne another. 4 1 I 2. collapsible core, comprising, a plurality or sections adapted to abut with one another to form an annular ring, andslidable devices, each arranged to lie partially 'within a'djacent sections to overlap the joint th erebetween,-whereby the sections may be lockedtogethe'ryeach of devices'adapted to be noved tolie wholly within a section so that, the SBClJlOllsHlZLY beseparated one from another, asdesired.

\ 3, A coll ps'ble coirefcomprising, an anl nlar r n m d up 'o p ia e i1 5 swans. id, s ctions ha ng e r kin nd. eb nections topr'event relative lateral displacement and slidable devices arrangedtolie wholly within certain sections adapted to be moved partially within 'abu tting sections ,to overlap the joints therebeti'veefn. M 4t. 1 collapsible core, comp'rising, an ainiular ring madeup of aplurality of sections, a circular slot formed ine the ring adjacent the inner edge thereof, keys curved tovfit said slot andarranged to 'be nioved from positions wholly within 'certain sections to positions wherein the joints between abutting sections are overlapped, and lreys in thetend tapes of certain sections adapted to interlock with abutting sections to prevent relative lateral displacement.

4, A collapsible core,comprising, an annw l ar fring made up of a plurality of sections whichare so formed that at least onetliereof is bodily removable inwardly, keys at the joints between. the sections. arranged to prevent relative lateral isplaceme'n't of the sections, slots formedin each or the latter arranged coincide with one another to form a circular slot and keys movable in said slots to overlap abuttingfsections, and orevent displacement 5 thereof.

c laps ef iiemiss n an an? tions to overlap the joints therebetween,

nular'ring made up of rpm; sectiongtwdof V wh ch re r lat el smal 'eda s d bodily removal inwardly, slots in a h 9t d a ra t co n d erm a e rp i 1 11 an i f il ey j ida in said slots and adap ed ta iew'1is11ytaa in the slots in the larger sectiofis, said keys adapted .to be moved to apositionwhe'rein they extend entirely thrpagathe smaller sections and project the'rebeyondon either s ijde t o :o verlap the joints between the smaller and thead jace'nt largersections.

v'vItLiAM Y. =De1vcia-JR. 

